code: def rand_start():
      year = np.random.randint(low=1900, high=2020)
      month = np.random.randint(low=1, high=13)
      day = np.random.randint(low=1, high=29)
      return f"{year}-{month:02d}-{day:02d}"
  
file_path: gluonts/test/dataset/test_arrow.py
imports: import sys
  import tempfile
  from pathlib import Path
  import numpy
  import pytest
  from gluonts.dataset.arrow import File, ArrowWriter, ParquetWriter
label_desc: Use image node_id 2 for calling a global function with example usage: rand_start() and returns: year, str, month, str, day